Anna scored 80 in both Course A and Course B. Course A had a mean of 70, and standard deviation of 10. Course B had a mean of 60 and standard deviation of 10. If both courses were curved using Z scores to determine final grades. O A. Anna did better in course B than in course A. O B. There is not enough information to tell whether she did better in Course A or Course B. C. Anna got the same grade from these two courses. O D. Anna did better in course A than in course B.

The first statistics exam had a mean of 71 and a standard deviation of 11 points; the second had a mean of 84 and a standard deviation of 7 points. Anna scored a 84 on both tests. Megan scored 88 on the first exam and 80 on the second. They both totaled 168 points on the two exams, but Anna claims that her total is better. Explain. The total of Anna's z-scores is 0.6, which is greater than Megan's total of 1 (Round to one decimal place as needed.) 14 14 14. 143 144 145 146 147

if an average score of exams was 74 points for 24 students  the 25th student got 64 points whats the new average if the standard deviation is 8.9 points?

Raul received a score of 77 on a history test for which the class mean was 70 with a standard deviation of 9. He received a score of 75 on a biology test for which the class mean was 70 with standard deviation 4.  On which test did he do better relative to the rest of the class

Suppose Professor Alpha and Professor Omega each teach Introductory Biology. You need to decide which professor to take the class from and have just completed your Introductory Statistics course. Records obtained from past students indicate that students in Professor Alpha's class have a mean score of 80% with a standard deviation of 5%, while past students in Professor Omega's Class have a mean score of 80% with a standard deviation of 10%. Decide which instructor to take for Introductory Biology using a statistical argument.

When I need to determine which standard deviation would give the better grade, what if the z-score is negative such as -.8 and -.4. Wouldn't the .-4 score provide a better grade because it's closer to m=42?   The oridinga score is 38 and the mean is 42 but there are two standard deviation scores of 5 (answer was -.8) and 10 (answer was -.4) and I need to decide which one give the better grade.

A researcher wants to know if men have a lower anxiety level than women in response to social rejection. The researcher brings 9 men and 16 women into a lab. He tells them all to write about a time they were socially rejected and he then measures their levels of anxiety using a 0-100 scale. The mean anxiety for men (A) was 81.67 with a standard deviation of 8.78. For women (B), he obtained a mean of 85.69 with a standard deviation of 4.8. A). What is the type of test you will use? (z-test, single-sample t-test, paired-samples t-test, or independent samples t-test) and why (what information provided in the problem) B). What are the hypotheses (Be Specific)

A large chemistry course took their final exam. The mean was 75 with a standard deviation of 8. What are the exam scores that separate the top and bottom 5 percent of the class (extreme 10%)?                             What are the exams scores that separate the middle 10% of the class (5% on each side of the mean)?                             What proportion of people scored in the A range (90 or above)?                       What proportion of people failed the exam (60 or belo

If the mean snowfall for Ottawa Ontario Canada is 98 inches per year and the standard deviation is 25 inches what percentage of the time does Ottawa receive less than 125 inches of snow?

Miranda and Karla began arguing about who did better on their tests, but they couldn't decide who did better given that they took different tests. Miranda took a test in Social Studies and earned a 71.4, and Karla took a test in Art History and earned a 60.9. Use the fact that all the students' test grades in the Social Studies class had a mean of 75.3 and a standard deviation of 10.7, and all the students' test grades in Art History had a mean of 66.4 and a standard deviation of 10.3 to answer the following questions.a) Calculate the z-score for Miranda's test grade.z=b) Calculate the z-score for Karla's test grade.z=c) Which person did relatively better? Miranda Karla They did equally well.